31221133130201 has 12 divisors (see below), whose sum is σ = 38454841047348. Its totient is φ = 25186796474112.

The previous prime is 31221133130189. The next prime is 31221133130219. The reversal of 31221133130201 is 10203133112213.

It can be written as a sum of positive squares in 2 ways, for example, as 29097771235225 + 2123361894976 = 5394235^2 + 1457176^2 .

It is not a de Polignac number, because 31221133130201 - 2²² = 31221128935897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31221133130501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18740175116 + ... + 18740176781.

It is an arithmetic number, because the mean of its divisors is an integer number (3204570087279).

Almost surely, 2^{31221133130201} is an apocalyptic number.

It is an amenable number.

31221133130201 is a deficient number, since it is larger than the sum of its proper divisors (7233707917147).

31221133130201 is a wasteful number, since it uses less digits than its factorization.

31221133130201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37480351928 (or 37480351921 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31221133130201 its reverse (10203133112213), we get a palindrome (41424266242414).

The spelling of 31221133130201 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred thirty-three million, one hundred thirty thousand, two hundred one".